That's why my two 100lb Black Labs live in the Garage and the back yard. If nothing else, they have a healthy bark and keen ears... that's enough to get someones attention quick.

Maybe string up some piano wire about a foot off the ground in a few key spots (where they could come or go from). Put it up each night before you go in and undo it in the morning... they won't run through your yard more than once!

Good luck with all this. Frustrating!